Dozens of large fires were burning across British Columbia (top left), Montana (bottom right), and Idaho (bottom center) on August 21, 2003. Hundreds of are already evacuated, and thousands more are on alert. Thick smoke chokes the skies and the fires are spreading rapidly through the forested terrain. This image of the fires, marked with yellow dots, was captured by the <a HREF="http://modis.gsfc.nasa.gov" target="outlink">Moderate Resolution Imaging Spectroradiometer</a> (MODIS) on the <a HREF="http://terra.nasa.gov/" target="outlink">Terra</a> satellite on August 21. Sensor: Terra/MODIS. Data Start Date: 8/21/03. Data End Date: 8/21/03.